Tunneling method as a semi-classical way is discussed, that gave insight
into Hawking radiations. The approach which we have used to study is robust.
It is applicable for a variety of spherically and cylindrically symmetric
solutions of Einstein's field equations to calculate the temperature of
Hawking radiations consisting of scalar and fermionic particles. In this
approach we have used Hamilton Jacobi method for the calculation of
classical action and tunneling probability for black strings and black holes. Finally, greybody factor as a characteristic of Hawking radiation will also be discussed.